Magnet switch



Feb. 18, 1936.

A L. M. PERSONS MAGNET SWITCH Filed oct. A16. 1933 l FURNME coNTRouNo 1necnANLsH VARHH A* ,Zawfezzce www .ment and combination of the variousoi.' Figure 5 in another Patented Feb. 13,1936

surpass MAGNET Lawrence M.

a corporation of Iowa Application october 1e. 1988.

Persons, Des to Penn Electric Switch 6-,

SWITCH Moinellowsassignor Despioinenlowa.

Seri!! No. 693,818

1o emma. ci zoo-noi,

The object o! my inven on isto provide amagnet switch which issimple,vdurable and comparatively in ve to manufacture.v

A further object o! my invention a switch structure in which a magnet isused for giving snap actionv to a switch arm, thev switch arm beingcharacterized by armatures, one on give stepped snap action, is equal inboth directions. A further object is to structure in which the o! theswitcharm. as be adjusted in a fool a magnetic shunt.

With these and other objects in view my invention consists in theconstruction, arrangepartsl of my the objects contemplated are atfullyset forth, illustrated in the is to provide as required.

provide a magnet switch dierential oi.' operation ailected by themagnet, can prooi manner by the use of device, whereby pointed out in myclaims, and

accompanying drawing. in which:

Figure l is a front mostat embodying elevation of a room thermyinvention and showing the cover therefor removed.

Figure 2 is a side elevation ot the same.

Figure 3 isan enlarged view. partlyvin section, showing the essentialparts of Figure l in a di!- !erent position.

Figure 4 is a iront elevation of the magnetic shunt feature oi* myinvention.

Figure 5 is an electro tic view showing one instailation'in which aswitch structure embodyingmy invention can be included.

' Figure 6 is a diagrammatic viewshowing parts position; and

Figure '1 is a similar diagrammaticview showing a modified form oiswitch structure.

gdrawing, I have used the Secured to the base il! is a post i! havingpi'voted thereon a bimetal coil carrier arm Il. A bimetai coil Il issecured, as at It, to the arm Il. y

The pivoted arm Il can be adjusted and is provided with a projection 20secured thereto i'or this purpose. The projection 2li is confinedbetween side bars 22 oi aiorked adjusting lever Il.

' The lever 2l lis pivoted at Il to the base Il, as

. to and located shown in the applicationl of Gustave A. Lennholm. tiledDecember i9, i932, serial No. 647,861.

A switch arm- Il is secured to the bimetal .coil il for swingingmovement thereby as caused by room temperature changes. The switch arm2l has a pair o! armatures ll and I2 secured thereon opposite sides oi apermanent l2. Thevbracket lil rial positioned against The screw 36extends into a bracket I0 which is securedtothebaseliiande toaterminaihas mounted thereon. a leaf spring carried contact 4I, while the switcharm 28 has a coacting leaf spring carried contact 4l. 10

An insulated stop screw 4l extends an ear-like extension oi the bracketIl for limiting movement oi the switch arm 2l in one direction. Itsmovement in the opposite direction is limited by a stopwfew Il throughx5 an ear oi a bracket 5I. Astop bar Il, a contact'arm Il and a leafspring mounted contact .Il are interposed the stop screw Il and acontact il carried by the switch arm it.

Il and are carried by the bracket ao l2, the arm li being swingbly byreason oi being secured to a leaf spring i! which carries the contacti8. The stillness of the springiicanbeadjustedbyasetscrewllcontactingwithanarmltwhichinturnengagelaothe spring i2.

In'connection withthe magnet 3l, I provide a magnetic shunt which ismade oi sott viron or other magnetic metal. It is in-the form ot a'plate riveted at 1li to the leaf spring' plate Il. 30 the shunt beingprovided with an opening 12 to accommodate the head oi the screw ll. Thetendency oi the leaf spring plate Il is to retain the magnetic shunt 0lagainst the poles of the magnet 3|. Thus the magnetic neld is variable35 for ailecting the armatures I! and Il. The neld can be increased byspacing the portion of the,` magnetic shunt adjacent the poles o! themagnet at a greater distance from the magnet, .as

cially adaptable- During the daytime the switch arm will operate througha range indicated in Figure. 3 as Dayrange. When at the lett extreme ofthe Day range, as shown in Figure 5, the circuit to the furnacecontrolling mechanism is broken be- 50 thermostat. 45

alsY

l of the arm 56, the

move it away from the magnet and to the right hand limit range 6 0 and58 will snap to When it opens the contactsfls, the room thermostatbecomes operative as a the Night range", closing the contacts 46 and Mthe magnet, and the other in which the armature 30 is movable as inFigure 3 to positions adjacent or slightly spaced from the magnet I4 andthe armature 32 is substantially spaced therefrom. The same constructioncan be applied to a three wire thermostat in which the switch arm 28 isprovided with contacts l2 and gfo'r instance as shown in Figure 7, forcooperation with contacts 88 and Il, one wire running to the switch arm2l and thereby the contacts 82 and 84 and the other two wires running tothe contacts 86 and 88.

where one circuit turns the furnace controlling and another turns iton". The switch arm in this instance would he movable to suicient, toosluggish.

The "Night range g Figure 3 can bereducedto any 4desired number inFigure 3,

of the switch shown in' of degrees below the "Day range. by increasingthe tension of the leaf spring 62, this being v is strictly undesirable.By having the screws 48 and Ell set at the factory, however, and usingmay be reasonably included within their scope.

I claim as myv invention: 1. In a switch for controlling an electriccircuit, a base, a horseshoe magnet mounted therewhen at opposite limitso1' its movement.

3. In a switch structure. a two arm is at its other limit o1' movement.

4. In a switch structure, a two pole magnet. a switch arm, a pair ofarmatures on said switch pairs of switch contacts, one pair engaged anddisengaged when'one armature is adjacent said magnet and the vother pairengaged and disengaged when the other armature is adjacent the magnet.

5. In a switch structure, a two pole magnet, a switch arm, a pair ofarmatures on said switch arm, said armatures being spaced from eachother and located on opposite sides of the poles of said magnet and eachin the magnetic field of both poles, said switch arm being movablethrough arange with one armature adjacent said poles at one limit ofmovement of the switch arm and the other armature thereadjacent at theother limit of movement of the switch arm and two pairs of switchcontacts, one pair engaged and disengaged when one armature is adjacentsaid magnet and the other pair engaged and disengaged when the otherarmature is adjacent the poles and said first mentioned armature is thensubstantially spaced therefrom.

6. In a control structure, a two pole magnet, a controller arm and apair of armatures on said arm, said armatures being spaced from veachother and located on opposite sides of the poles of said magnet and eachin the magnetic eld of both poles, said lcontroller arm being movablethrough a range with one armature adjacent said poles at one limit ofmovement of the arm and the other armature thereadjacent at the otherlimit of movement of the arm.

7. In a switch structure, a two pole magnet. a switch arm, a pair ofarmatures on said switch arm, said armatures being spaced from eachother and located on opposite sides oi' the poles of said magnet andeach in the magnetic field of both poles, said switch arm being movablethrough a range with one armature adjacent said poles at one limit ofmovement of the switcii arm and the other armature thereadjacent at theother limit of movement of the switch arm, switch contacts engaged andseparated by said switch arm when at opposite limits of its movement anda magnetic shunt for said magnet to change the differential of operationof said switch arm.

8. In a switch structure, a two pole magnet,

Aa switch arm, a pair of armatures on said switch arm, said armaturesbeing spaced from each other and located on opposite sides o! the polesof said magnet and each in the magnetic iield of both poles, said switcharm being movable through a range with one armature adjacent said polesat one limit of movement of the switch arm and the other armaturethereadjacent at the other limit' of movement of the switch arm, twopairs of switch contacts, one pair being engaged when the switch arm isat one limit of its movement and the other pair being engaged when theswitch arm is at its other limit of movement and a magnetic shunt-forvarying the intensity of the magnetic iield of the magnet on said switcharm.

9. Ina switch structure, a two pole magnet, a switch arm, a pair ofarmatures on said switch arm, said armatures being spaced from eachother and located on opposite sides of the poles of said magnet and eachin the magnetic iield of both poles, said switch arm being movablethrough a range withone armature adjacent said poles at one limit ofmovement of the switch arm and the other armature thereadjacent at theother limit of movement of the switch arm, two pairs of switch contacts,one pair engaged and disengaged when one armature is adjacent said polesand the other pair engaged and disengaged when the other armature isadjacent said poles and a magnetic shunt for varying the intensity otthe magnetic field of the magnet on said switch' arm.

10. In a switch for opening and closing an electric circuit, a base, ahorseshoe magnet xed on said base, an operating arm movably mounted onsaid base for movement simultaneously toward or away from both polesoi'4 said. magnet and a magnetic shunt for varying the intensity of themagnetic iield aiecting said operating arm, said magnetic shuntcomprising a pole shunting element, a leaf spring secured thereto and tosaid base, said leaf spring being under tension to bias said poleshunting element to engage the poles of said magnet, and a set screwthreaded in said pole shunting element and engaging said magnet to forcesaid pole shunting element away therefrom against the constraint of saidleaf spring member.

LAWRENCE M. PERSONS.

